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1
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
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Answer: Option C
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2
A spring material should have low
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Answer: Option D
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3
Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
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Answer: Option B
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4
Alloy powder manufactured by the following process have spherical shapes.
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Answer: Option C
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5
Fire refining process is employed in case of
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Answer: Option B
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6
Hot extrusion process is not used for making
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Answer: Option A
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7
Addition of beryllium to copper is done mainly to produce a/an __________ alloy.
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Answer: Option A
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8
In __________ process, ions of salts react with water to produce acidity or alkalinity.
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Answer: Option B
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9
Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.
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Answer: Option C
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10
The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
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Answer: Option C
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